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.TH SEM_CLOSE 3 2021-03-22 "Linux" "Linux Programmer's Manual"
.SH NAME
sem_close \- close a named semaphore
.SH SYNOPSIS
.nf
.B #include <semaphore.h>
.PP
.BI "int sem_close(sem_t *" sem );
.fi
.PP
Link with \fI\-pthread\fP.
.SH DESCRIPTION
.BR sem_close ()
closes the named semaphore referred to by
.IR sem ,
allowing any resources that the system has allocated to
the calling process for this semaphore to be freed.
.SH RETURN VALUE
On success
.BR sem_close ()
returns 0; on error, \-1 is returned, with
.I errno
set to indicate the error.
.SH ERRORS
.TP
.B EINVAL
.I sem
is not a valid semaphore.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.ad l
.nh
.TS
allbox;
lbx lb lb
l l l.
Interface	Attribute	Value
T{
.BR sem_close ()
T}	Thread safety	MT-Safe
.TE
.hy
.ad
.sp 1
.SH CONFORMING TO
POSIX.1-2001, POSIX.1-2008.
.SH NOTES
All open named semaphores are automatically closed on process
termination, or upon
.BR execve (2).
.SH SEE ALSO
.BR sem_getvalue (3),
.BR sem_open (3),
.BR sem_post (3),
.BR sem_unlink (3),
.BR sem_wait (3),
.BR sem_overview (7)
.SH COLOPHON
This page is part of release 5.13 of the Linux
.I man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
\%https://www.kernel.org/doc/man\-pages/.
